import React, { Component } from 'react'
import  './index.css'

export default class Item extends Component {

  // 标识鼠标移入、移出
  state = {mouse: false}

  // 鼠标移入、移出的回调
  handleMouse = (flag) => {
    return () => {
      this.setState({mouse: flag})
    }
  }
  // 勾选、取消 勾选某一个todo的回调
  handleCheck = (id) => {
    return (event) => {
      this.props.updateTodo(id, event.target.checked)
    }
  }

  // 删除一个todo的回调
  handleDelete = (id) => {
    console.log('通知APP删除',id)
    if(window.confirm('确定删除吗?')) {
      this.props.deleteTodo(id)
    }
    
  }

  render() {
    const {id, name, done} = this.props
    const {mouse} = this.state
    return (
      <li style={{backgroundColor: mouse ? '#ddd' : 'white'}} onMouseEnter={this.handleMouse(true)} onMouseLeave={this.handleMouse(false)}>
        <label>
          <input type="checkbox" checked={done} onChange={this.handleCheck(id)}/>
          <span>{name}</span>
        </label>
        <button className="btn btn-danger" style={{display:mouse ? 'block' : 'none'}} onClick={() => this.handleDelete(id)}>删除</button>
      </li>
    )
  }
}
